The interaction of linear polyphosphates with titanium dioxide surfaces

Michelmore, Andrew; Gong, Wenwen; Jenkins, Paul J.; Ralston, John

doi:10.1039/b001213k

Cited by 86 publications

(82 citation statements)

References 15 publications

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“…Thus, the binding mechanisms of condensed phosphates on metal hydroxide play a key role in (1) improving the phosphate adsorption efficiency, (2) predicting its adsorption behavior with the presence of other phosphates, and (3) identifying the mobility of condensed phosphates and their availability to plants. A few studies had been conducted to explore the adsorption mechanisms of condensed phosphates on ferrihydrite [24], Fe(OH) 3 [25], titania [26], and titanium dioxide [27] and revealed that ligand exchange occurred and inner-sphere complexes formed when condensed phosphates were adsorbed on titania and titanium dioxide [26,27]. However, the structure of the complexes formed between condensed phosphates and aluminum/ferric hydroxide has never been described.…”

Section: Introductionmentioning

confidence: 99%

Surface complexation of condensed phosphate to aluminum hydroxide: An ATR-FTIR spectroscopic investigation

Guan

Liu

Chen

et al. 2005

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Surface complexation of condensed phosphate to aluminum hydroxide: An ATR-FTIR spectroscopic investigation

Guan

Liu

Chen

et al. 2005

Journal of Colloid and Interface Science

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“…The oligonucleotide sequence was matching the sense stand of the R18S ribosomal RNA gene: 5′ ttccttggatgtggt-glycerol 3′ (R18Ss) universally present in mammalian cells (16). OH groups of glycerol bound loosely to the surface of the nanoparticles, similarly to the OH groups of phosphates (22). Such nanoconjugates were mixed with Gd CA in 1:69 molar ratio (for active surface sites ratio of 1:0.1).…”

Section: Synthesis Of Nanoparticles and Nanoconjugatesmentioning

confidence: 99%

Gadolinium-conjugated TiO2-DNA oligonucleotide nanoconjugates show prolonged intracellular retention period and T1-weighted contrast enhancement in magnetic resonance images

Paunesku

Dharmakumar

et al. 2008

Nanomedicine: Nanotechnology, Biology and Medicine

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Nanoconjugates composed of TiO 2 nanoparticles, DNA oligonucleotides and a gadolinium contrast agent were synthesized for use in magnetic resonance imaging. Transfection of cultured cancer cells with these nanoconjugates showed them to be superior to the free contrast agent of same formulation with regard to 1) intracellular accumulation, 2) retention and 3) subcellular localization. Our results have shown that 48 hours after treatment, the concentration of gadolinium in nanoconjugate treated cells was 1000 fold higher compared to cells treated with contrast agent alone. Consequently, T 1 -weighted contrast enhancements were observed in cells treated with nanoconjugates but not in cells treated by the contrast agent alone. This type of nanoconjugate with increased retention time, Gd accumulation and intracellular delivery may find its use in gadolinium neutron-capture cancer therapy.

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“…Phosphate sorption was first studied by CIR-FTIR in goethite slurries [52], then by ATR in ferrihydrite suspensions [27] and on TiO 2 [26,32,48,64] or SiO 2 [26] thin layers. Spectra of phosphate solutions for different pH were recorded, and the stretching frequencies are listed in table 6.…”

Section: Phosphatementioning

confidence: 99%

“…Bromide and iodide species seems to have less affinity for surface sites than chloride, on alumina [41,47] and anatase [45]. KBr was used [26,48] A hint for relevant concentrations range for environmental studies may be found in the limit concentration of pollutants as defined by the European directive on the quality of water [51].…”

Section: Solutionmentioning

confidence: 99%

In situ Fourier-transform infrared spectroscopy studies of inorganic ions adsorption on metal oxides and hydroxides

Lefèvre

2004

Advances in Colloid and Interface Science

278

182

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In this work, the studies describing the use of attenuated total reflection -infrared spectroscopy to obtain information on the sorption mechanism of inorganic ions on metal oxy-hydroxides are reviewed. ATR-IR is amongst the rare techniques which allow to analyze the sorption phenomena in situ and led to several results about the speciation of sorbed anions (sulfate, carbonate, phosphate, perchlorate, ...) or ternary inorganic complexes since it is able to distinguish outer-sphere and inner-sphere complexes. The principles of this method are summarized, and the experimental protocols, the results and the limitations are detailed. The sample deposition method, initially based a paste or a concentrated suspension, have evolved towards the coating of the ATR crystal by a colloid layer, increasing the sensibility and the reproducibility of the measurements. Observed absorption frequencies of ions sorbed on metal oxy-hydroxides (goethite, hematite, alumina, silica, TiO 2 , ...) are reported to help the identification of peaks in new experimental works. This method, characterized by an in situ analysis performed with a special cell used in a widespread instrumentation (IR spectrometer), is very recent but its advantages suitable for the current problems in the sorption field should help its rapid development for the next years.

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The interaction of linear polyphosphates with titanium dioxide surfaces

Cited by 86 publications

References 15 publications

Surface complexation of condensed phosphate to aluminum hydroxide: An ATR-FTIR spectroscopic investigation

Surface complexation of condensed phosphate to aluminum hydroxide: An ATR-FTIR spectroscopic investigation

Gadolinium-conjugated TiO2-DNA oligonucleotide nanoconjugates show prolonged intracellular retention period and T1-weighted contrast enhancement in magnetic resonance images

In situ Fourier-transform infrared spectroscopy studies of inorganic ions adsorption on metal oxides and hydroxides

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